H4 magneto testing

SW EM · Dec 4, 2016

I would like to remove the H4 magneto off of a tractor I am working on with the purpose of testing/cleaning it. I am not able to crank over the engine, so that is why I want to remove it to
test it. If I do this, I just have to re-install it with the rotor in the same position as when I removed it right? Any tips on bench testing it? Thank you.

gene bender · Dec 4, 2016

Yes just make sure the rotor is pointed the same way and you will have no trouble putting it back. I put them in the vice and hook up one wire to a grounded plug as i use a batt drill to turn them over and can check the fire at different speeds when i have finished working on them cause if it fires you know when installing that it is ready to go. I have a used mag gear i use in the drill so its easy to chuck in the drill you could use asocket that fits the nut saw off the female end of a cheap extension to chuck in the drill to drive it when in the vice.

SW EM · Dec 4, 2016

Thanks Gene, good info.

H4 magneto testing

SW EM

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gene bender

Well-known Member

SW EM

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